Start off with 40,to 50 lb leader from dypsy to spinny,lighter will work but a big boy (or smaller) tail will beat yer leader many hundreds of time swimmin away on each run....
Make shure your dypsy is set soo loose it "almost" trips on its own,you will get better and more hookups...HOW? when yer dypsy trips it flips and pulls to the side ,up,or whatever direction puttin yer spinny sideways for a sec increasing hook pressure and "suprising fish" causing it to swim oppisite direction....
Plus when you go to trip to reel in you wont be stressing yer line knots.
If yer loosing whole rig it ant nothing more than mishandling ,careless deploying (kinks,or goofy swivel angle) ,,storage of wire rod ,,freys weakspots,, Or the guys downrigger you just cut off...........................